Lock



July 12, 1932. ANDREWS I 1,867,244

LOCK

Filed 001;. 14, 1930 2? 1& Pa

//vve- To B Patented July 12, 12932 stares ime-1 rn nnr-nronnenonnANDREWS, or TAIEAPE? new ZEALAND, ASSIGNOR ro BROOKS, orwnnnmeron,znnnnnn I v 7 Applicatien filed Octoberll, 193a. Seria1 1q'o.88,613.

This invention relates to locks for door-s and tlie -likeand'particularly to that type of lock in which a bolt is given areciprocating niovenient by means of a key adapted to engage-withinanextended portion in which an: opening" is formed, and having inclinedtop'and'lower edges against which the key engagesforinoving the bolt.

The-object of the present invention is to add I greater securityto suchlocks andat the same time to reduce the cost of manufacture thereof. a

iiccording to the present invention levers pivoted on pinsin theircasing have their 'rea-r ends ex -tended to traverse the curve'd'or Vinclined edges I of the opening and their for-- ward ends engaging-thetailsof locking pawls also pivoted on pins in the casing andadapted .to-be brought together by'a' spring so that their tront'en'dswill engage behind a shoulder on thebolt' and normally retain the boltin-its locked 'or shot position As the rear ends-'o'Pt-helevers are'operaited' by the key,

their front ends will depress-'thelocking pawls "andihrin them outof'engagernent'with the bolt'tlie-reoy permitting'the bolt to return toits retracted position when the key engages ani'nclined edge of theopening.

The levers have extensions, one of which 'has'a pin passing in the slotof the other en'- tension so that'if one lever is operated by the keythe opposite lever will also be opened. The invention will now bedescribed with the aid of the accompanying drawing, where- Figure 1 isaview of th'el'ock with the cover of the casingrerhoved, and the lockingboltin its retracted position Figure 2 7 in a=shotor locked position. Inthis view for simplicity the latch is not included} 'Figure'?) isa crosssection along line33 Figure 2. V

Referring to-the drawing; the usual locking; bolt 1 is provided with itsextended plate 2 having an opening 3 therein. The upper and lower edgesof the opening have respectively inclined or curved edges 4 and 5 aainst which the key will be adapted to; strike for the purpose ofplacing the bolt in a shot or reis a similar view showingthe bolt.

tracted: position. The; sliding rnovement of the bolt islirnited by'apin'G fiXe'd to the'casin' and passing through: a slot 7 in the plate'Levers S and 9 pivoted on pins 10 and ll respectively havetheirfrespective 'rear ends 12 3 and 13 extending across theinclinededges 4: and 5 of the plate 2.; The frontjends; 14 and 15 of the levers8 and'9 bear uponthe' tails-16' and 17 of thepawls'18 and 19 pivoted" onpins. 20 and 21 respectively and have-theirfront ends 22 and 23Ibearing.upon the side of the bolt 1. A coilspring 24 connects these two pawlsand normally retainsthe levers" 8 and9 in an inward position as inFigure'l, Ar1ns26 and 27'resp'ectivelyon the levers 8 and 9 areconnected 'by a 'p in 28 on the arinr 27 passing through a slot'29o-fthe'arni 26 so that IIIlOVQITlGHtS of one lever are. transmitted tothe other lever. V V v The key hole 30 has two pivot holes, one eachend, so that when the'key'fal is insert- 7 ed in position in theupperpivot hole and rotated to the positionshownlin,Figure- 1,

the end 12 of the lever 8 will 'enter the slot 32.073 the key and, as.thelr'evis continued to be rotated, its outer edge will strike the.

curved edge at. of the opening 3. shoot the bolt forward in the usualmanner to the position shown in Figure 2. Irnmedifatelyi this occurs thelevers 18 an'dl9 being 'd'rawni towards each other by the spring 24,Will cause the front ends 22 and23 to engage behindthe shoulder 38ofitheboltjL thereby locking the bolt? in its shot position.

To bring the bolt .to' its retracted" position, the kev, .being 1n theposition'shown in Figure '2, may now beturned in; the opposite; direce V,tionuntil. the slots 32 of the hey again en gageithe end 12 orthe'leverS, pushing'the lever back to the'position' shown in dottedlines 1 in Figure 2; which corresponds" to the position sh'ownlin'Figure 1, and" depressing the paw-ls '18 and '19; thereby disengagingthe front'end 22 and 23 froni the shoulderpt the bolt. ,Bycontinu-edrotation theouter" edge of the keywill strike thecurvedfedge 1andreturn -the b oltirto its retractedposition, as shown in nigureqllSimilarly, the key is insertedintlle lowerprvo'tihole; it would operateithe lever- 135i'1ras1mr1ar manner, and the movements being transmittedto the opposite lever bymeansof the arms 26 and 27. a I

A latch member 40 has a spindle 41 on which is located a vcoil spring 42in compression between the head of the member and a guide stop 43 fixedto the casing, the rod being extended and having a downwardly dependingend 44 operable'from the latch spindle 50. 7

- The lever 8 is shown with a slot. 45 into which-projects a pin 46 fromthe plate 2. In

the position shown in Figure 1 the pin lies ina notch 47 so that thebolt cannot be shot until the lever 8" is disengaged. When the positionshown in Figure 2 is reached the pin enters a notch 48 which willprevent the bolt beingretracted even although the pawls 18 and 19 areclear of the bolt. A further notch 49 from the slot 45 will engage thepin 4'6 shouldthe lever be raised beyond the redifferent key is requiredto correspond to.

'qui'red position; thus, 'shouldany'keybe used that will raise the lever8 so that the notch 49 engages thepin 46 the bolt cannot, belretracted.

The opening 3'can be varied and also the width and thickness ofthelevers so that a each variation of lock/ Thus, if the levers .S'and 9extend slightly more or less over the opening? then a key with adifferent i depth of slot would be required, or the thick- 'thebolt.

"the required amount by a key of the correct depth any variation of thenotch 48 prevents the lock being operated except by a key made ness ofthe leversimay be varied, in which case the width of the key slot isalso varied. 7 If the lever. 8 above is used without the pawls 18 and19, then the slot 45-a-nd pin 46' will, provided thelever is under thetension of a spring, give an effective looking to Since the lever 8 mustbe raised for the particular variation. This arrangement makes the lockvery difiicult to pick since the lever must be lifted exactly clear ofthe notches 48 and 49 before the bolt can be retracted.

hat I claim is g p 1. A lock including a casing, a locking bolt, a platefrom said locking bolt having key contacting edges, levers pivoted tosaid casing and traversing the key. contactingedges of said plate inorder to be actuated. by the key, spring operated pawls pivoted tosaid'casing one upon each, side of said locking bolt and normallyresting thereon and conhasjbeen shot'said pawls will under their spring'tension engage and retain said lock-- ing bolt in its shot position.

2. In the lock as claimed in claim 1, le-

vers pivoted on pins projecting from the v lockica'sing, the rear end ofsaid levers traversing the opening in said'plate, the front end 7 jofjsaid levers bearing upon the rear ends of,

said spring operated pawls, said levers ari edges of said plate in orderto be actuated by the key, said lever havingits front end 7 formed soasto pass over said locking bolt and having a slot formed in its frontend, a pin fixed to said locking bolt and passing through the slot atthe front end of said lever, the rear end of said lever having a slotwith a notch forming part of the slot, a pin projecting from said 7plate) and passing the said pin on the'plate adapted to engage throughthe slot in the rear end of said lever, 3 V

the notch when the bolt is in its shot position thereby retaining it inthat position, and

spring means controlling said lever to retain it 111 engagement on saidpin.

7 w I 4. In the lock as claimed in clai'm3, the.

rear end of the said lever containing the slot 1 formed with a furthernotch from the slot whereby shouldthe said lever .be operatedbeyond therequired position bythe key the said pin will engage. the notch andprevent further movement of thelever and the looking bolt, V

5 In the lock as claimed in claiin 1, a coil sprlng attached to the saidpawls todrawsaid pawls in engagement with the locking bolt and alsoretain said levers in their normal.

position acrossthe key contacting edgeseof the plate from said lockingbolt.

6. A look including a casing, a lockingv bolt, a plate from said lockingbolt having key contacting edges, a leverpivoted to said caslng andtraversing the .key contacting edges of said plate in order to beactuated by the key, a pawl pivoted to saidcasing and normally restingupon the side of the locking bolt, a shoulder on said locking bolt. anend. of 521d pawl adapted to engage said shoul-' der when the bolt is inits shot position, a

spring normally to hold'the said pawl in. engagement with said shoulder,the other end of said pawl engaged bythe end of said lever I wh ch whenmoved by the contact of the key said pawl is disengaged from saidshoulder and the bolt enabled to be moved to a retracted position.trolled by the said levers, but when sald bolt I ln-tes'timony whereof Ihavesigned my 7 name to this specification.

FREDERICK HAROLD ANDREWS.

